At a middle school 20 minutes away from the scene of Wednesday's tragedy, drama teacher Meagan Nagy cleaned out a closet with her students so they could see: There's a place to hide if this happens here.

In the days following the mass shooting at a Parkland, Florida, high school that killed 17, several teens who purportedly shared similar sentiments across the country have been arrested for threatening their schools.

Marckles Alcius, 31, has been charged with stealing a bakery delivery truck and crashing it into a Planned Parenthood in New Jersey. Three people suffered minor injuries in the attack: One victim was a staff member and the other two were patients, including a pregnant woman, Essex County prosecutors said.

On Jan. 5, the caller left information on Nikolas Cruz's "desire to kill people, erratic behavior, and disturbing social media posts, as well as the potential of him conducting a school shooting," the FBI said.